Stoker for furnaces and boilers of the underfeed type.



J. MGGULLOGH.

STOKER FOR FURNACES. AND BOILERS OF THE UNDERPEED TYPE. APPLIGATIO'NFILED 0GT.12, 1912.

1,113,569. I Patented Oct. 13,1914.

2 $HEETS-SHBET 1.

WITNESSES: y7'4 A 6 INVENTOR,

/6 ATTORNEY.

I J. MGOULLOCH. STOKEE FOR FURNACES AND BOILERS OF THE UNDERFEED TYPE.

APPLICATION 111.1111 001.12, 1912.

1 1 1 3,569. Patented 0@1;. 13,1914.

Z SHEETS-SHEET 2.

ATTORNEY.

' sectional view'through the furnace taken at UNITED STATES PATENToFFIoE.

JA MES MOCULLOCH, OF GLASGO'W, SCOTLAND,ASSIGNOR GE ONE-HALF T0 JOSEPHONEIL, OF HOLYOKE, MASSACHUSETTS.

i Specification of Letters Patent.

PatentedOct. 13,1914.

Application filed October 12, 1912. Serial No. 725,510.

To all whom it may concern Be it known that I, JAMES ,MoCULLooH, asubject of the King of Great Britain, residing at Glasgow, Scotland,have invented new and useful Improvements in Stokers for Furnaces'andBoilers of the Underfeed.

fuelis partially pushed downward through the grate into the ash an. Inexternal appearance it resembles t e type known as the Latrobe stovethat is designed to be placed in the wall of a house, the forwardpart'ofthe furnace or stove projecting into th room. 1 I p.

Referring to the draw1ngs,-F1gure 1 1s an exterior side view of thecompleted stove in which-the feed lever with its ratchet mechanism isshown. Flg. 2 1s a vertical right angles to the axis on which the coalpushers are mounted and showing the cam action for forcingthe coalpressers outward. and withdrawing them as they leave the rear end of thefire box. Fig. 3 is a perspective view of one of the detached coalpresser ole.- IIIQ IItS showing the cam construction by means of whichit is forced downward and withdrawn during the. rotary movement of theshaft. Figs. 4 and 5 are detail views of the cam member which causesthemovements of, the coal pushers, v

Referring to the drawings in detail a designatesthe forward part of thestove and b the rear'part or section the two sectionsbeing'securedtogether by any suitable means as bolts shown at c. Theforward section a isprovided with doors indicated at a? that are hingedto the front section at the point e by means of which they may be openedand closed as desired.

f designates buttons or catches that have a threaded stem 9 forholdingthe doors in a closed position. When it is desired to open the doorsthese catches are turned'into the dotted line position shown at f.

Located back of the doors is the fire box or grating h. This, as shownin Fig. 2, is

substantially one-quarter of a circle or 90;

the forward edge of which is curved as indicated at 2'. The lower partof the grate which extends rearwardly rests on the bottom of the forwardsection and against the front edge of the rear section as shown at 7'.An ash pan is indicated at 70 by means of which the ashes ma beconveniently removed fro-m the stove. t is understood that when thedoors d are open that the ash pan is can be removed and also the grate hif desired. The products of combustion which pass from the fire-box mpass upward in the space 0 back ofthe doors and through the opening 0 tothe smoke flue g. A damper r is inserted in this flue for controllingthe rate of com'- bustion.

-The coal supply which is contained in the hopper 8,,1s lntroducedthrough the inlet t that is closed by means "of a cover u. The

fuel which is preferably ofa fine grade of coal is stored in the rear ofthe presser wheel indicated as a whole by the letter 4). This presserwheel is made up of a spider construction, the spokes of which areindicated at w and in the construction shown there are four of them. Theouter ends of these spokes areformed with curved arc-shaped portionswhich feed lever carries a pawl 6 to engage the teeth 7 of the ratchetwheel 8. A second pawl 9 is shown attached to the casing to preventtherearward movement of the shaft .4. during the feeding operation. Asshown in Fig. 2, the inner portion of the shaft is made rectangular andpasses through a correspondingly shapedopening in the hub of the spiderof the feeder wheel, whereby when the shaft 4 is turned the feed wheeland the pushers will be rotated.

Referring to the.construction of the coal pressersas shown in Fig. 3 itwill be noticed that the edge 10 of these pressers is formed with thesame radius of curvature as the arcshaped members a: of the presserwheel and that. when these pressers are withdrawn-they will lie withinthe periphery of the wheel. These coal press'ers have a recess, 11 thatreceives the horn-shaped member 3 of the spider and about which the coalpressers [turn .when moved outward as the presser wheel is rotated. 12designates a stop portion on the lugs 13 to limit the outward movementof the coal pressers by engaging the end of the arc-shaped members w.The lugs '13 also serve as cam-surfaces to'move the presser members 3outward'as will be described. At one side ofthese stops'are shown lugs14: which engage the projections 18 of the fixed cams 14'- which arefixedly secured to the rear casing b by means of the arm 16 and rightangular end portions 17. The fixed cams 14" are formed with twocam-surfaces 15 and 15. The lugs 14; as they engage the projectionsl8'are moved into the retracted position until they reach the pointshown in Fig. 2 where they will be forced outward as illustrated, theoutward position serving to force the coal forw'rirdaridtinto the grateat the lower part of the same. Rotation of the shaft 4 by the lever .5causes the portion 14 to engage the projections 18, whereby the coalpresser 3 is retracted into the' position shown at 3 and it retains thisposition until it is again brought into use to feed a fresh supply ofcoal-to the fire. In. Fig. 2 is shown a partition or division platebetween the chamber 0 and the coal hopper s, the same is designated at19 and consists of a plate which extends from the passage p down to andabove the feed wheel where it extends forward as indicated at 20. 21designates a fire brick that covers this plate and serves to confine theheat to the forward part of'the stove and prevent its being conducted tothe coal hopper s. It

will be seen from this construction that the stove is very simple inconstruction and one that could be manufactured very cheaply and alsoone that could be readily installed for heating purposes. If desired theplate '21 may be removed and the smoke flue inserted at this point. Itis of course, understood that the coal is pushed forward through theopening 22 into the fire box at'm.

.It should be stated that when the coal presser elements 3 are inoperation that the part-'11 serves as a pivot about which it rotates onthe portion 00; It is also noticed that the shape of the'cross-sectionalend of the, presser 3'is symmetrical, that is to say the arc-shapedsides 10 and 101 are equal which is the same radius as the portion at.The'cam surface 15 which is of shorter radius that thecam-surface 15serves to allow a space for the lugs 14 to travel in to normall maintainthe pressers 3 extended until withdrawn.

22 designates an opening for supplying air to the fuel which may beclosed by suitable covers.

Referring to the manner in which the pressers '3 are forced or movedoutward when the handle 5 is operated, the edges -13"of the cam 13 rideupon the cam-surfaces 15 of the fixed cam 14 and are thereby graduallymoved outward into the position shown in Fig 2. They are retained inthis outward position until the lugs 14 engage the projections 18 whenthe pressers 3 are retracted into a position to coincide with theperiphery of the feeder wheel.

lVhat I claim, is

l. In a stove of the underfeed type, the combination, a forward and arear section united together, a partition to divide the two sections toform a coal hopper and the heating section, a feed wheel mounted in thelowerpart of the coal hopper, means for rotating the feed wheel toadvance the fuel through a passageway leading from the coal hopper tothe fire box portion of the heating section, said feed wheel having aspider portion, the outer ends of the spokes of which are madearc-shaped, coal presser elements having arc-shaped recesses and mountedon the arc-shaped portions of the spokes, two lugs formed on the presserelements, means to project and withdraw the coal presser elements whenthe said wheel is rotated, said means comprising a fixed cam to engageone of the lugs on the coal pressers to project the presser elements anda projection on the fixed cam engaged by the other lug on the presserelements to cause tating said wheel, coal presser elements adapted to beextended be 0nd and drawn into the general curved sur ace of the wheel,said elements having curved recesses therein to receive the projectionsof the wheel device and about which said elements are adapted to beoscillated, fixed cams to cause the presser elements to be forcedoutward,

each of the presser elements having lugs to engage the periphery of thecam surface, and interengaging projections on the cam, and coal presserelements to cause the same to be retracted,'as described.

JAMES MoCULLOOH. Witnesses:

JAMES LAC-EY, ALEXANDER MANSON.

